Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-2.16'
  to 57c0f0be81242067a01f6639a659bbdd3904e274
  - Merge branch 'stable-2.15' into stable-2.16
    
    * stable-2.15:
      Cancel pending replications upon shutdown
      Remove replication event from pending when runway is allowed
    
    Change-Id: I81209708a42832cbe2be818e2dd50f625362b392
    
  - Cancel pending replications upon shutdown
    
    When the replication plugin is stopped or reloaded,
    mark all the current replications as cancelled.
    Having pending and unmanaged replication tasks is quite
    dangerous for two reasons:
    
    1. The result of the replication isn't accounted and
       properly managed, because the associated objects won't
       be there anymore (pending replications, runway, ...)
    
    2. The destination configuration could have changed completely
       (auto-reload use-case) or even not exist anymore: the
       replication event would thus perform an unwanted and
       unconfigured operation.
    
    With regards to the replication events that are already
    on the runway, there is no value in cancelling them. Just flag
    them as cancelled so that, once they finish, can be clearly
    recognized.
    
    Change-Id: Iabc17d375011cbc61f8c642ae07d3d018b49fc69
    
  - Remove replication event from pending when runway is allowed
    
    Consider a replication event not pending anymore *only if* the runway
    is free and allowed to run. Removing it too early would result in a
    ghost event which isn't officially pending but that will be eventually
    run when rescheduled.
    
    Change-Id: Ib0ffa3bec7a6d5d5be56e78a677e8b2133f91e18
    
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